Describe the concept of "percentage rent" in retail leases including the breakpoint.

 Describe the concept of "percentage rent" in retail leases including the breakpoint. Your paper should include examples of specific types of locations where a percentage rent clause is normally expected and the types of businesses which could reasonably be expected to pay percentage rent. What are some typical percentage rents by type of business? You should answer the question "Why is it necessary to know a business' approximate "gross profit" or "gross margin" before signing a lease with a percentage rent clause?"